Lanthanoid contraction is caused due to :

(a) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

(b) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

(c) the same effective nuclear charge from Ce to Lu

(d) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

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In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:

(a) np

(b) ns

(c) (n-1)d

(d) (n+1)s

Concept Questions :-

Modern Periodic Table
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In a periodic table from I group to VII group electronegativity of elements:

(a) decreases

(b) increases

(c) remains constant

(d) all of these

Concept Questions :-

Screening Effect
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Which represents the electronic configuration of the most electropositive element?

(1)[He]2s1

(2)[Xe]6s1

(3)[He]2s2

(4)[Xe]6s2

Concept Questions :-

Electronic Configuration
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An element X is placed in group IA of the perodic table because it forms:

(a) an oxide which is acid

(b) a volatile chloride having formula XCl2

(c) an ionic chloride having formula XCl

(d) an insoluble chloride XCl4

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Which one of the following is an amphoteric oxide?

(a) SO2

(b) B2O3

(c) ZnO

(d) Na2O

Concept Questions :-

Nature of Compound
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Elements which generally exhibit multiple oxidation states and whose ions in aqueous medium are usually coloured aand whose ions in aqueous medium are usually coloured are:

(a) metalloids

(b) transition elements

(c) non-metals

(d) gases

Concept Questions :-

Modern Periodic Table
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Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

(a) ns and np orbits

(b) (n-1)d and ns orbits

(c) (n-1)d orbits

(d) ns orbits

 

Concept Questions :-

Modern Periodic Table
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In II period most acidic oxide is formed by:

(a) F

(b) N

(c) O

(d) Li

Concept Questions :-

Nature of Compound
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Elements of group IB and IIB are called:

(a) normal elements

(b) transition elements

(c) alkaline earth metals

(d) alkali metals

Concept Questions :-

Modern Periodic Table
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